Hardness
Grain Size
Fracture
Streak
Porosity
Luster
Compressive Strength
Cleavage
Toughness
Specific Gravity
Transparency
Density
Specific Heat Capacity
Resistance
Medium to Fine Coarse Grained
Dull to Grainy with Sporadic parts Pearly and Vitreous
Heat Resistant, Wear Resistant
White, Greenish White or Grey
Dull to Vitreous to Submetallic
Impact Resistant, Pressure Resistant, Wear Resistant